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Derivative Instruments and Hedging Activities (Details - Fair Value of Derivatives) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Derivative, Collateral [Abstract]    
Derivative Asset, Fair Value, Amount Offset Against Collateral $ 6  
Derivative Liability, Fair Value, Amount Offset Against Collateral 18  
Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 8,609 $ 3,862
Derivative Asset 131 165
Derivative Liability (14) (31)
Derivative Asset (Liability), Net 117 134
Fair Value Hedging [Member] | Interest Rate Contract [Member] | Designated as Hedging Instrument [Member]    
Derivatives, Fair Value [Line Items]    
Derivative, Notional Amount 8,609 3,862
Derivative Asset 131 165
Derivative Liability (14) (31)
Derivative Asset (Liability), Net $ 117 $ 134